This is superbly done. There are inaccuracies with the use of the reins and the bit is too bulky, which, like weapons, is often the case with scale models. The stirrups are also too bulky. If he is holding one pair of reins, it should be the curb rein, not the snaffle rein, but cavalry officers of the time were usually outstanding horseman who seemed to regard a cavalry charge as only one step up from hunting, much to Wellington's disquiet (!), and would usually have hold of both reins. Men-at-Arms No.138, British Cavalry Equipments 1800 - 1941 and Chapter five of British Napoleonic Uniforms by Franklin, both have detaails of cavalry bridles of the time. The latter also shows how the reins were held, which was also in the Historex catalogues of the past. Franklin's book is a mine and wealth of information for any British Wellingtonian modellers.
Mike